Evaporator



H. FOTHERGILL EvAPomvroRv Fiied June 21. 1921 esmas-sheet 1 June 17,`1924. 1,49%@

H. EOTHERGILI. Y

EVAPORATOR Filed June 21 w21' s sheets-Shen 2 f. 1, 5 I?, l

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. HA m? Y ICTHEE/LL Patented June l?, i924,

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HARRY FQTHERGILL, 'WESTlv/INSTER, LONDON, ENGLAND.

EVAEO B-ATOR.

Application filed 21., 1321. Serial No.. 479,252.

To cZZ Lc/icm t may cof/Accra; l

Be it known that I, HARRY FOTHERGILL, of Westminster, London, in thecounty of London. England, have invented certain new` and usefulImprovements in Evaporators, of' which the Jfollowing is aspecification. c

This invention consists oi an improved evaporator, and relatesparticularly to the method employed for coupling the coils to a steaminlet chamber and a water drainchamber. I

It is common practice in evaporators to braze the ends of the coils tohollow coupling pieces which extend into the chambers above mentionedand are held in position by external nuts. Such an arrangement, however,necessitates the withdrawal ot the couplingpieces Ytrom the chamberswhenever it is desired to remove a coil, and this necessitates either alarge or special termation ot the evaporator body, or such a dispositionot the steam inlet and drainage chambers as is not always convenient. Itis also common practice to use a coupling union. which is screwed intothe interior wall of ,the steam space and drainage chambers, but withsuch an arrangement it tre quentlv happens that when uncoupling the coilfrom the union, the union is `unintentionally unscrewed or loosened inthe wall ot the evaporator.

Ahe present invention consists of a particular construction andVarrangement of evaporator as hereinafter described, and the inventionalso involves an improved coupling piece which is designed forsimplicity ot construction and ease oi manipulation.

An evaporator constructed in accordance with my invention comprises ahollow shell having at it`s trontan 'opening iitted with a verticaldoor, and on each side oit the open ing is arranged a chamber in theform of a vertical passage. One oit' these chambers Forms a steam' spacefor the inlet into the coils, while the other chamber forms a space forthe collection of the water drainage. The coils are connected to thechambers by removably secured fitments.

ln order that the invention may be clearly understood and readilycarried into practice the same will now be more fully described withreference to the accompanying drawings in which Fig. 1 is an elevationpartly in section showing an evaporator constructed in ac cbrdancecwiththe invention the door being removed to show the coils in position. Thisfigure also shows the form of coupling piece.

Fig. 2 is a sectional plan through the shell showing one form of baille.

Fig. 3 is an enlarged sectional through the .shell and door.

Fig. 4 is an enlarged sectional detail of one ot the coupling pieces.

Fig. 5 is an elevation similar to Fig. l of an evaporator having aseparate steam dome and modified form of battle, the coils beingremoved. Y l

Fig. ,Gis a sectional elevation taken as on the line 6-6 of Fig. 5*, thesteam dome being omitted.l

Referring to the drawings the numeral 1 represents the shell of theevaporator, 2 the door, 3 the steam inlet chamber, 4 the water drainagechamber and 5 the steam coils.

The coi-ls 5, which may be oi' the single or double type, are arrangedin horizontal planes with one end connected to the steam inlet chamber3. and the other end connected to the water drainage chamber 4 bycouplings of the kind hereinbefore referred to in general. The lowerportion of the steam inlet chamber 3 may be separated by a parlition 3a,and the lower coil in the evaporator so arranged that the hot drainagewater 'from the drainage chamber passes through it into the lower andseparate portion of the steam chamber from which the drainage water isdischarged through the cock 3b. By this means a portion of the heat inthe drainage water ycan be beneficially used for heating the water inthe base oir-the evaporator. Y

in the arrangement shown in Figs, l to 4 each coupling piece consists ofa hollowl iitment of substantiallyv T torni, each of the ends 5a of thecoil being brazed or otherwise connected with the leg 6a ofthe 'l'titments 6 which titments and the coil to which they are attached areremovably secured in position by means oft a bolt 7 passing through thesteam inlet chamber 3 and drainage chamber a respectivelyand the crosspiece 6b of the appropriate 'l' litment, a nut 8 screwing on to the endoiE the bolt 7 this nut in the example shown being located within`theevaporator shell. The coupling bolts 7 may be made of non-corrosivematerial and may, if desired, be reversed from the position shown in thedrawings so that the nuts S are on the outside ofthe evaporator shell.

x plan sa v Lees leo Thus, to remove a coil, it is only neeessarv Y toremove the evaporator door 2 in the usual Way, a crane bar 9 beingprovided for this purpose, unsoreiv 'he nuts 8 and Witl'idfanv the bolts7 when the coil 5 as a Whole is tree to be removed. ln the oase ofevaporators of small size a simple bame plate 10 located in the upperportion of the shell and retained in position by support-ing lugs 11servesto prevent any Water being carried away with the steam;7

The joints between the coupling piece ant the steam or drainage chamberand the bi l"Y and nut are niade With Washers of suitabl material suolias a combination of copper and asbestos, recesses 12a being provided inthe Walls ot the steam, or drainage chamber to receive suoh Washers.

Referring to Fig', 5 the upper portion lEl of'the shell or aseparateportion attached thereto, forms a doine or steam space for thesteam generated by the evaporator. he stean'i which Venters this ydomeor steam space preterably passing through a suitable bar -e 14e Whichprevents Water being carried away by the steam; as shown in this figurethe baille 1li is carried by supports bolted or otherwise secured to thebaille base 16 locat-l ed Within the evaporator shell or dome l. Thearrangement is such that any nfater which may be carried through thebattle is collected and drained through a pipe, or a passage 17 (Fig. 6)in the shell of the evaporator, and delivered to the base.

The evaporators are provided With the usual external inountings andmeans for supporting the coils. rEhe eoil supports oonsist of bars 18riveted into supportingv plates lf) bolted or otherwise secured to theshell.

rlfhe steam is introduced into the steam inlet chamber 3 through a screwlitt valve and it Will be understood that it passes into the respectivecoils through the openines 13 and hence into thev drainage chamberthrough the openings 3a, the water beine drained otlE` or discharged b3'means of thel cock 3" at the bottom of the evaporator'.

Vvlhat l claim and desire to secure b v Letters Patent isz 1.frieflfaporator comprising shell l i an opening, ve; olo o aening, asteam inle connected at one end to the steam inlet ber and at the otherend to the A age chamber, coupling pieces for effect'. the Connection ofsaid coils, said couplii pieces each comprising` a holler: tinent oisubstaitialrjvv 5J-torni to the sii. which one end ot the coil penisi ll volts aeapted to be p; inlet and `VWater drei g "lu-shaped litinent,and

sei-1L boltu 2. fin evaporator comprising` holitm4 steam inleteliainber, a crater drains each connected at one end shell, a agechamber, coils to the steam inlet cliainben end to the Water chan lnevaporator-s, a shell, steam inlel'V ai water drainage chambers in thevial said shell, removable coil, havir 'i l subftantiall)v Lvlshapedlitinents whose gie legs are perinanenthy secured to the c ends, saidlitments being` adairted to so cured in position b3' bolts passingthrongV the cross pieces of said hollow itinents an i through the steaminlet and Water drain s spaces oil' the evaporator, substantiallyspecified. i

Sn 'iiestiinong` whereof, l my signature.

HARRY FOTl-iERGlLL.

